The is HDPE, so it should be able to withstand boiling temps for sanitizing. At 5,000 mL, it is around 1.32 gallons.
What could you use this for? I'm thinking either a small batch fermenter or for a large starter. Hey, while you're at it, you could do both.
EDIT: Homebrew Finds Reader Alex makes a great point in his comment below. Thanks Alex!
The 10 L version is only a couple dollars more.
Bel-Art 109060010 Scienceware High-Density Polyethylene Wide Mouth Round Bottle with Heavy Duty Closure, 232mm Dia x 310mm H, 10000ml Capacity - $16.67 + Free Shipping with $25 order